Method for driving display panel and display apparatus

Patent metadata

Field	Value
Publication number	US-11657757-B2
Application number	US-202117364485-A
Country	US
Kind code	B2
Filing date	Jun 30, 2021
Priority date	Apr 30, 2021
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

A method for driving a display panel and a display apparatus are provided. The display panel includes a display region including a fingerprint recognition region and includes subpixels located in the display region, and the subpixels include first subpixels located in the fingerprint recognition region and used as a light source for fingerprint recognition. In a first mode, the subpixels are scanned at a first frequency, and in the second mode, the subpixels are scanned at a second frequency. The second frequency is greater than the first frequency. The method includes: when the display panel is in the first mode, monitoring whether the display panel receives a fingerprint recognition requirement, and if yes, controlling the display panel to enter a trigger state; and when the display panel is in the trigger state, scanning the first subpixels at a frequency greater than the first frequency.

First claim

What is claimed is:

1. A method for driving a display panel, wherein the display panel has a display region comprising a fingerprint recognition region and comprises subpixels located in the display region and an emission driving circuit, and the subpixels comprise first subpixels located in the fingerprint recognition region and are used as a light source for fingerprint recognition;
wherein the display panel has working modes comprising a first mode and a second mode, wherein the subpixels are scanned at a first frequency in the first mode, and the subpixels are scanned at a second frequency in the second mode, wherein the second frequency is greater than the first frequency; and
wherein the method comprises:
when the display panel is in the first mode, monitoring whether the display panel receives a fingerprint recognition requirement, and if it is monitored that the display panel receives the fingerprint recognition requirement, controlling the display panel to enter a trigger state; and
when the display panel is in the trigger state, scanning the first subpixels at a frequency greater than the first frequency;

wherein the display panel further comprises:
M pixel rows, wherein each of the M pixel rows comprises at least two of the subpixels arranged along a row direction, and the first subpixels are located in an x th pixel row of the M pixel rows to a y th pixel row of the M pixel rows, wherein 1≤x<y≤M, and M is a positive integer greater than 1; and

wherein the emission driving circuit is electrically connected to a first emission frame start signal line, a second emission frame start signal line, and the M pixel rows,
wherein, when the display panel is in the first mode, the method further comprises: successively outputting, by the emission driving circuit in response to a first emission frame start signal, an emission signal to the 1 st pixel row to the M th pixel row, and
wherein, when the display panel enters the trigger state, the method further comprises: successively outputting, by the emission driving circuit in response to a second emission frame start signal, the emission signal to at least the x th pixel row to the y th pixel row; and
wherein, when the display panel is in the first mode, a frequency at which the emission driving circuit outputs the emission signal is greater than the first frequency, and
wherein, when the display panel enters the trigger state, the frequency at which the emission driving circuit outputs the emission signal is equal to the frequency at which the first subpixels are scanned.

2. The method according to claim 1 , wherein the display panel further comprises:
a scanning driving circuit electrically connected to a first scanning frame start signal line, a second scanning frame start signal line, and the M pixel rows; and
wherein when the display panel is in the first mode, the scanning driving circuit successively outputs, in response to a first scanning frame start signal provided by the first scanning frame start signal line, a scanning signal to a 1 st pixel row of the M pixel rows to an M th pixel row of the M pixel rows, and when the display panel is in the trigger state, the scanning driving circuit successively outputs, in response to a second scanning frame start signal provided by the second scanning frame start signal line, the scanning signal to at least the x th pixel row to the y th pixel row.

3. The method according to claim 2 , wherein the scanning driving circuit comprises N 1 first scanning shift units that are cascaded, wherein the N 1 first scanning shift units are electrically connected to the M pixel rows, and an i th first scanning shift unit of the N 1 first scanning shift units is electrically connected to the x th pixel row, wherein N 1 is a positive integer greater than 1, and 1≤i<N 1 ;
the first scanning frame start signal line is electrically connected to a 1 st first scanning shift unit of the N 1 first scanning shift units, and the second scanning frame start signal line is electrically connected to the i th first scanning shift unit;
said the scanning driving circuit successively outputting the scanning signal to the 1 st pixel row to the M th pixel row comprises: providing, by the first scanning frame start signal line, an effective level, and providing, by the second scanning frame start signal line, a non-effective level in such a manner that the N 1 first scanning shift units are controlled to successively output the scanning signal to the 1 st pixel row to the M th pixel row; and
said the scanning driving circuit successively outputting the scanning signal to at least the x th pixel row to the y th pixel row comprises: providing, by the second scanning frame start signal line, an effective level in such a manner that the i th first scanning shift unit to an (N 1 ) th first scanning shift unit of the N 1 first scanning shift units are controlled to successively output the scanning signal to the x th pixel row to the M th pixel row.

4. The method according to claim 2 , wherein the second scanning frame start signal line is connected to a first suppression module in series; and
in a process in which the scanning driving circuit successively outputs, in response to the first scanning frame start signal, the scanning signal to the 1 st pixel row to the M th pixel row, the first suppression module is configured to suppress signal transmission on the second scanning frame start signal line.

5. The method according to claim 2 , wherein if it is monitored that the display panel receives the fingerprint recognition requirement, the method further comprises:
determining whether the scanning driving circuit is in a scanning process where the scanning driving circuit is outputting the scanning signal to the 1 st pixel row to the M th pixel row; and
if it is determined that the scanning driving circuit is in the scanning process, waiting for the scanning driving circuit to output the scanning signal to the M th pixel row and then controlling the display panel to enter the trigger state; or if it is determined that the scanning driving circuit is not in the scanning process, directly controlling the display panel to enter the trigger state.

6. The method according to claim 2 , wherein if it is monitored that the display panel receives the fingerprint recognition requirement, the method further comprises:
determining whether the scanning driving circuit is performing scanning and is in a scanning process where the scanning driving circuit outputs the scanning signal to an (x+1) th pixel row of the M pixel rows to the M th pixel row; and
if it is determined that the scanning driving circuit is performing scanning and is in the scanning process, directly controlling the display panel to enter the trigger state; or if it is determined that the scanning driving circuit is not performing scanning or is not in the scanning process, waiting for the scanning driving circuit to output the scanning signal to the M th pixel row and then controlling the display panel to enter the trigger state.

7. The method according to claim 2 , further comprising:
pre-storing a number n of times of high frequency scanning, wherein n is a positive integer greater than or equal to 1, wherein one time of scanning process during which the scanning driving circuit successively outputs, in response to the second scanning frame start signal, the scanning signal to the x th pixel row to the y th pixel row is one time of high frequency scanning; and
when the display panel is in the trigger state, performing n times of high frequency scanning on the first subpixels.

8. The method according to claim 7 , wherein, when n>1, in processes of the n times of high frequency sc

Assignees

• Shanghai Tianma Micro Elect Co

Inventors

• Yao Qijun
• Zhou Xingyao
• He Shui

Classifications

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G06V40/1318

  using electro-optical elements or layers, e.g. electroluminescent sensing · CPC title

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• G06F3/03547

  Touch pads, in which fingers can move on a surface · CPC title